> If the user is typing in a form field while an update to the app state comes

Could you give a practical example of what you mean here? I can't quite wrap my head around what kind of interaction you're describing.

Do you mean some kind of scenario like a shared document with multiple people editing it? This is a very niche case.

> This means when the DOM resets, there's no problem with elements getting removed and added back in,

Could you give a practical example of this? I've been building web apps for a long time and I don't know what "when the dom resets" means.